[John Robert]

Quote:

BAG END INFRASUB-18 SELF POWERED SUBWOOFER Direct radiating 18" cone loudspeaker in a sealed enclosure, and a 400 watt power amplifier mounted to an aluminum plate on the back of the enclosure. Includes built in ELF dual integrator providing a flat acoustical response down to 8 Hertz. For music and surround bass. Best sounding sub on the planet! Same system used by Todd-Ao, Warner Bros, Paramount, Twickenham (UK) and other studios to mix sound on major movies. ? 3dB from 8 Hz to 95

It seems that we've all been wasting our time with room treatments, bass eq's, calibration, etc., when this guy out of the box is +/- 3db down to 8 hz!


Isn't there an FTC, BBB or someone else to regulate this? And don't these companies think that anyone is paying attention? Buyer beware...


John

 

[Terence]

Here is more info on the 8hz claim from Bag End.

Quote:

HOW LOUD AT 8 HERTZ: While the INFRASUB-18 will reproduce 8 Hz, it is not audible nor does it have enough acoustical power for you to feel it. The measurements are taken at close range with sensitive instruments. To achieve a flat response, full amplifier power is used at the lowest frequencies and very little (

 

[JRace]

No where does that make any claims to you having response down to 8hz in your room.

 

[Terence]

Quote:

Originally posted by JRace No where does that make any claims to you having response down to 8hz in your room.

Yeah, maybe if you stick in a closet you can get 8hz????????!

 

[Drew Eckhardt]

You can equalize to achieve any response you want although maximum volume at lower frequencies is limited by excursion, and perhaps some form of electronic limiter so that expensive things don't happen when drivers reach their mechanical limits.


I use active speakers equalized for an anechoic -3dB point of 30Hz, -6dB of 20Hz. Although they have enough displacement to stay linear up to 118dB @ 80Hz, the woofer suspensions run out of travel arround 105dB @ 40Hz and 87dB @ 20Hz.


For music this isn't a problem - there's little content at those frequencies, but for home theater I don't run them full-range.


The same limitations apply to regular speakers - power output approaching their F3 point may be severely limited, with unaceptable distortion occuring long before then.